Wireless Terminal Feedback via Dual Transmission Schemes
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Solution Overview
Problem
In wireless communication systems that use carrier sense, feedback information is not stably and efficiently notified due to contention with other wireless terminals, and wireless terminals with different modulation schemes or antenna configurations may struggle to decode channel reservation information, leading to unreliable transmission.
Innovation Solution
A wireless communication system that employs both basic and advanced transmission schemes, where the first wireless terminal transmits a frame using the second transmission scheme and the second wireless terminal responds using the first transmission scheme, allowing for stable and efficient notification of reception status and transmission control information, even in systems with diverse modulation schemes and antenna configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If feedback information is transmitted as individual data upon carrier sense under contention with other wireless terminals, then the transmission slot can be acquired flexibly, but the feedback information cannot be stably and efficiently notified
Solution Approach 1:
The transmission process is divided into two distinct phases: a request phase where the transmitting terminal sends a request frame to acquire a transmission slot, and a response phase where the receiving terminal sends feedback information. This segmentation separates the contention-based slot acquisition from the reliable feedback transmission, allowing the request frame to be sent under carrier sense conditions while the feedback is transmitted in a dedicated response slot reserved for the receiving terminal.
Solution Approach 2:
The transmitting terminal performs preliminary action by sending a request frame in advance to acquire a transmission slot before actually transmitting feedback information. This preliminary request phase secures the transmission rights, allowing the receiving terminal to later transmit feedback information in the acquired slot without contention, thus ensuring stable and efficient feedback notification.
2Reliability
If a frame containing channel reservation information is transmitted in advance to prevent contention, then transmission stability is improved, but wireless terminals incapable of decoding the frame cannot utilize the reservation
Solution Approach 1:
Different transmission schemes are applied to different frames based on their function and the capabilities of terminals. The request frame uses a transmission scheme that ensures broad compatibility so that all terminals can decode it and set their NAV (network allocation vector) values. The response frame uses a transmission scheme optimized for feedback transmission. This local differentiation of transmission quality ensures that channel reservation information is effectively communicated to all terminals while maintaining system reliability.
Solution Approach 2:
The request frame is designed with universal characteristics that allow it to be decoded by all wireless terminals regardless of their specific capabilities. By making the request frame universally compatible, the system ensures that all terminals can participate in the NAV setting process, while the response frame can utilize more advanced transmission schemes for optimized feedback delivery.
3Speed
If the receiving terminal transmits feedback information immediately upon reception, then timeliness is improved, but contention with other terminals occurs and stability deteriorates
Solution Approach 1:
The receiving terminal performs preliminary action by setting its NAV value upon receiving the request frame, before actually transmitting feedback information. This preliminary NAV setting reserves the transmission slot in advance, allowing the receiving terminal to transmit feedback information immediately and reliably without encountering contention, thus achieving both timeliness and stability.
Solution Approach 2:
The system implements feedback through a structured exchange where the receiving terminal sends feedback information back to the transmitting terminal after receiving the request frame. The NAV mechanism ensures that this feedback transmission occurs in a reserved slot, preventing contention and ensuring stable feedback delivery while maintaining timeliness through the efficient request-response protocol.
Data Source
AI summary
A wireless communication system includes first and second wireless terminals capable of performing transmission by at least one of a first transmission scheme and a second transmission scheme. The first wireless terminal performs transmission of a first frame to the second wireless terminal by using the second transmission scheme. The second wireless terminal communicates with the first wireless terminal to notify the first wireless terminal of information associated with a status of the reception of the first frame transmitted from the first wireless terminal by using the first transmission scheme.